/* * hostapd / IEEE 802.11 Management: Beacon and Probe Request/Response * Copyright (c) 2002-2004, Instant802 Networks, Inc. * Copyright (c) 2005-2006, Devicescape Software, Inc. * Copyright (c) 2008-2012, Jouni Malinen * * This software may be distributed under the terms of the BSD license. * See README for more details. */ #include "utils/includes.h" #ifndef CONFIG_NATIVE_WINDOWS #include "utils/common.h" #include "common/ieee802_11_defs.h" #include "common/ieee802_11_common.h" #include "common/hw_features_common.h" #include "wps/wps_defs.h" #include "p2p/p2p.h" #include "hostapd.h" #include "ieee802_11.h" #include "wpa_auth.h" #include "wmm.h" #include "ap_config.h" #include "sta_info.h" #include "p2p_hostapd.h" #include "ap_drv_ops.h" #include "beacon.h" #include "hs20.h" #include "dfs.h" #ifdef NEED_AP_MLME static u8 * hostapd_eid_rm_enabled_capab(struct hostapd_data *hapd, u8 *eid, size_t len) { if (!hapd->conf->radio_measurements || len < 2 + 4) return eid; *eid++ = WLAN_EID_RRM_ENABLED_CAPABILITIES; *eid++ = 5; *eid++ = (hapd->conf->radio_measurements & BIT(0)) ? WLAN_RRM_CAPS_NEIGHBOR_REPORT : 0x00; *eid++ = 0x00; *eid++ = 0x00; *eid++ = 0x00; *eid++ = 0x00; return eid; } static u8 * hostapd_eid_bss_load(struct hostapd_data *hapd, u8 *eid, size_t len) { if (len < 2 + 5) return eid; #ifdef CONFIG_TESTING_OPTIONS if (hapd->conf->bss_load_test_set) { *eid++ = WLAN_EID_BSS_LOAD; *eid++ = 5; os_memcpy(eid, hapd->conf->bss_load_test, 5); eid += 5; return eid; } #endif /* CONFIG_TESTING_OPTIONS */ if (hapd->conf->bss_load_update_period) { *eid++ = WLAN_EID_BSS_LOAD; *eid++ = 5; WPA_PUT_LE16(eid, hapd->num_sta); eid += 2; *eid++ = hapd->iface->channel_utilization; WPA_PUT_LE16(eid, 0); /* no available admission capabity */ eid += 2; } return eid; } static u8 ieee802_11_erp_info(struct hostapd_data *hapd) { u8 erp = 0; if (hapd->iface->current_mode == NULL || hapd->iface->current_mode->mode != HOSTAPD_MODE_IEEE80211G) return 0; if (hapd->iface->olbc) erp |= ERP_INFO_USE_PROTECTION; if (hapd->iface->num_sta_non_erp > 0) { erp |= ERP_INFO_NON_ERP_PRESENT | ERP_INFO_USE_PROTECTION; } if (hapd->iface->num_sta_no_short_preamble > 0 || hapd->iconf->preamble == LONG_PREAMBLE) erp |= ERP_INFO_BARKER_PREAMBLE_MODE; return erp; } static u8 * hostapd_eid_ds_params(struct hostapd_data *hapd, u8 *eid) { *eid++ = WLAN_EID_DS_PARAMS; *eid++ = 1; *eid++ = hapd->iconf->channel; return eid; } static u8 * hostapd_eid_erp_info(struct hostapd_data *hapd, u8 *eid) { if (hapd->iface->current_mode == NULL || hapd->iface->current_mode->mode != HOSTAPD_MODE_IEEE80211G) return eid; /* Set NonERP_present and use_protection bits if there * are any associated NonERP stations. */ /* TODO: use_protection bit can be set to zero even if * there are NonERP stations present. This optimization * might be useful if NonERP stations are "quiet". * See 802.11g/D6 E-1 for recommended practice. * In addition, Non ERP present might be set, if AP detects Non ERP * operation on other APs. */ /* Add ERP Information element */ *eid++ = WLAN_EID_ERP_INFO; *eid++ = 1; *eid++ = ieee802_11_erp_info(hapd); return eid; } static u8 * hostapd_eid_pwr_constraint(struct hostapd_data *hapd, u8 *eid) { u8 *pos = eid; u8 local_pwr_constraint = 0; int dfs; if (hapd->iface->current_mode == NULL || hapd->iface->current_mode->mode != HOSTAPD_MODE_IEEE80211A) return eid; /* Let host drivers add this IE if DFS support is offloaded */ if (hapd->iface->drv_flags & WPA_DRIVER_FLAGS_DFS_OFFLOAD) return eid; /* * There is no DFS support and power constraint was not directly * requested by config option. */ if (!hapd->iconf->ieee80211h && hapd->iconf->local_pwr_constraint == -1) return eid; /* Check if DFS is required by regulatory. */ dfs = hostapd_is_dfs_required(hapd->iface); if (dfs < 0) { wpa_printf(MSG_WARNING, "Failed to check if DFS is required; ret=%d", dfs); dfs = 0; } if (dfs == 0 && hapd->iconf->local_pwr_constraint == -1) return eid; /* * ieee80211h (DFS) is enabled so Power Constraint element shall * be added when running on DFS channel whenever local_pwr_constraint * is configured or not. In order to meet regulations when TPC is not * implemented using a transmit power that is below the legal maximum * (including any mitigation factor) should help. In this case, * indicate 3 dB below maximum allowed transmit power. */ if (hapd->iconf->local_pwr_constraint == -1) local_pwr_constraint = 3; /* * A STA that is not an AP shall use a transmit power less than or * equal to the local maximum transmit power level for the channel. * The local maximum transmit power can be calculated from the formula: * local max TX pwr = max TX pwr - local pwr constraint * Where max TX pwr is maximum transmit power level specified for * channel in Country element and local pwr constraint is specified * for channel in this Power Constraint element. */ /* Element ID */ *pos++ = WLAN_EID_PWR_CONSTRAINT; /* Length */ *pos++ = 1; /* Local Power Constraint */ if (local_pwr_constraint) *pos++ = local_pwr_constraint; else *pos++ = hapd->iconf->local_pwr_constraint; return pos; } static u8 * hostapd_eid_country_add(u8 *pos, u8 *end, int chan_spacing, struct hostapd_channel_data *start, struct hostapd_channel_data *prev) { if (end - pos < 3) return pos; /* first channel number */ *pos++ = start->chan; /* number of channels */ *pos++ = (prev->chan - start->chan) / chan_spacing + 1; /* maximum transmit power level */ *pos++ = start->max_tx_power; return pos; } static u8 * hostapd_eid_country(struct hostapd_data *hapd, u8 *eid, int max_len) { u8 *pos = eid; u8 *end = eid + max_len; int i; struct hostapd_hw_modes *mode; struct hostapd_channel_data *start, *prev; int chan_spacing = 1; if (!hapd->iconf->ieee80211d || max_len < 6 || hapd->iface->current_mode == NULL) return eid; *pos++ = WLAN_EID_COUNTRY; pos++; /* length will be set later */ os_memcpy(pos, hapd->iconf->country, 3); /* e.g., 'US ' */ pos += 3; mode = hapd->iface->current_mode; if (mode->mode == HOSTAPD_MODE_IEEE80211A) chan_spacing = 4; start = prev = NULL; for (i = 0; i < mode->num_channels; i++) { struct hostapd_channel_data *chan = &mode->channels[i]; if (chan->flag & HOSTAPD_CHAN_DISABLED) continue; if (start && prev && prev->chan + chan_spacing == chan->chan && start->max_tx_power == chan->max_tx_power) { prev = chan; continue; /* can use same entry */ } if (start && prev) { pos = hostapd_eid_country_add(pos, end, chan_spacing, start, prev); start = NULL; } /* Start new group */ start = prev = chan; } if (start) { pos = hostapd_eid_country_add(pos, end, chan_spacing, start, prev); } if ((pos - eid) & 1) { if (end - pos < 1) return eid; *pos++ = 0; /* pad for 16-bit alignment */ } eid[1] = (pos - eid) - 2; return pos; } static u8 * hostapd_eid_wpa(struct hostapd_data *hapd, u8 *eid, size_t len) { const u8 *ie; size_t ielen; ie = wpa_auth_get_wpa_ie(hapd->wpa_auth, &ielen); if (ie == NULL || ielen > len) return eid; os_memcpy(eid, ie, ielen); return eid + ielen; } static u8 * hostapd_eid_csa(struct hostapd_data *hapd, u8 *eid) { if (!hapd->cs_freq_params.channel) return eid; *eid++ = WLAN_EID_CHANNEL_SWITCH; *eid++ = 3; *eid++ = hapd->cs_block_tx; *eid++ = hapd->cs_freq_params.channel; *eid++ = hapd->cs_count; return eid; } static u8 * hostapd_eid_ecsa(struct hostapd_data *hapd, u8 *eid) { if (!hapd->cs_freq_params.channel || !hapd->iface->cs_oper_class) return eid; *eid++ = WLAN_EID_EXT_CHANSWITCH_ANN; *eid++ = 4; *eid++ = hapd->cs_block_tx; *eid++ = hapd->iface->cs_oper_class; *eid++ = hapd->cs_freq_params.channel; *eid++ = hapd->cs_count; return eid; } static u8 * hostapd_eid_secondary_channel(struct hostapd_data *hapd, u8 *eid) { u8 sec_ch; if (!hapd->cs_freq_params.sec_channel_offset) return eid; if (hapd->cs_freq_params.sec_channel_offset == -1) sec_ch = HT_INFO_HT_PARAM_SECONDARY_CHNL_BELOW; else if (hapd->cs_freq_params.sec_channel_offset == 1) sec_ch = HT_INFO_HT_PARAM_SECONDARY_CHNL_ABOVE; else return eid; *eid++ = WLAN_EID_SECONDARY_CHANNEL_OFFSET; *eid++ = 1; *eid++ = sec_ch; return eid; } static u8 * hostapd_add_csa_elems(struct hostapd_data *hapd, u8 *pos, u8 *start, unsigned int *csa_counter_off, unsigned int *ecsa_counter_off) { u8 *curr_pos = pos; u8 *csa_pos = pos; if (!csa_counter_off || !ecsa_counter_off) return pos; *csa_counter_off = 0; *ecsa_counter_off = 0; curr_pos = hostapd_eid_csa(hapd, curr_pos); /* save an offset to the csa counter - should be last byte */ if (curr_pos != pos) *csa_counter_off = curr_pos - start - 1; csa_pos = curr_pos; curr_pos = hostapd_eid_ecsa(hapd, curr_pos); /* save an offset to the eCSA counter - should be last byte */ if (curr_pos != csa_pos) *ecsa_counter_off = curr_pos - start - 1; /* at least one of ies is added */ if (pos != curr_pos) { curr_pos = hostapd_eid_secondary_channel(hapd, curr_pos); #ifdef CONFIG_IEEE80211AC curr_pos = hostapd_eid_wb_chsw_wrapper(hapd, curr_pos); #endif /* CONFIG_IEEE80211AC */ } return curr_pos; } static u8 * hostapd_gen_probe_resp(struct hostapd_data *hapd, const struct ieee80211_mgmt *req, int is_p2p, size_t *resp_len) { struct ieee80211_mgmt *resp; u8 *pos, *epos; size_t buflen; #define MAX_PROBERESP_LEN 768 buflen = MAX_PROBERESP_LEN; #ifdef CONFIG_WPS if (hapd->wps_probe_resp_ie) buflen += wpabuf_len(hapd->wps_probe_resp_ie); #endif /* CONFIG_WPS */ #ifdef CONFIG_P2P if (hapd->p2p_probe_resp_ie) buflen += wpabuf_len(hapd->p2p_probe_resp_ie); #endif /* CONFIG_P2P */ #ifdef CONFIG_FST if (hapd->iface->fst_ies) buflen += wpabuf_len(hapd->iface->fst_ies); #endif /* CONFIG_FST */ if (hapd->conf->vendor_elements) buflen += wpabuf_len(hapd->conf->vendor_elements); if (hapd->conf->vendor_vht) { buflen += 5 + 2 + sizeof(struct ieee80211_vht_capabilities) + 2 + sizeof(struct ieee80211_vht_operation); } resp = os_zalloc(buflen); if (resp == NULL) return NULL; epos = ((u8 *) resp) + MAX_PROBERESP_LEN; resp->frame_control = IEEE80211_FC(WLAN_FC_TYPE_MGMT, WLAN_FC_STYPE_PROBE_RESP); if (req) os_memcpy(resp->da, req->sa, ETH_ALEN); os_memcpy(resp->sa, hapd->own_addr, ETH_ALEN); os_memcpy(resp->bssid, hapd->own_addr, ETH_ALEN); resp->u.probe_resp.beacon_int = host_to_le16(hapd->iconf->beacon_int); /* hardware or low-level driver will setup seq_ctrl and timestamp */ resp->u.probe_resp.capab_info = host_to_le16(hostapd_own_capab_info(hapd)); pos = resp->u.probe_resp.variable; *pos++ = WLAN_EID_SSID; *pos++ = hapd->conf->ssid.ssid_len; os_memcpy(pos, hapd->conf->ssid.ssid, hapd->conf->ssid.ssid_len); pos += hapd->conf->ssid.ssid_len; /* Supported rates */ pos = hostapd_eid_supp_rates(hapd, pos); /* DS Params */ pos = hostapd_eid_ds_params(hapd, pos); pos = hostapd_eid_country(hapd, pos, epos - pos); /* Power Constraint element */ pos = hostapd_eid_pwr_constraint(hapd, pos); /* ERP Information element */ pos = hostapd_eid_erp_info(hapd, pos); /* Extended supported rates */ pos = hostapd_eid_ext_supp_rates(hapd, pos); /* RSN, MDIE, WPA */ pos = hostapd_eid_wpa(hapd, pos, epos - pos); pos = hostapd_eid_bss_load(hapd, pos, epos - pos); pos = hostapd_eid_rm_enabled_capab(hapd, pos, epos - pos); #ifdef CONFIG_IEEE80211N pos = hostapd_eid_ht_capabilities(hapd, pos); pos = hostapd_eid_ht_operation(hapd, pos); #endif /* CONFIG_IEEE80211N */ pos = hostapd_eid_ext_capab(hapd, pos); pos = hostapd_eid_time_adv(hapd, pos); pos = hostapd_eid_time_zone(hapd, pos); pos = hostapd_eid_interworking(hapd, pos); pos = hostapd_eid_adv_proto(hapd, pos); pos = hostapd_eid_roaming_consortium(hapd, pos); pos = hostapd_add_csa_elems(hapd, pos, (u8 *)resp, &hapd->cs_c_off_proberesp, &hapd->cs_c_off_ecsa_proberesp); #ifdef CONFIG_FST if (hapd->iface->fst_ies) { os_memcpy(pos, wpabuf_head(hapd->iface->fst_ies), wpabuf_len(hapd->iface->fst_ies)); pos += wpabuf_len(hapd->iface->fst_ies); } #endif /* CONFIG_FST */ #ifdef CONFIG_IEEE80211AC if (hapd->iconf->ieee80211ac && !hapd->conf->disable_11ac) { pos = hostapd_eid_vht_capabilities(hapd, pos); pos = hostapd_eid_vht_operation(hapd, pos); } if (hapd->conf->vendor_vht) pos = hostapd_eid_vendor_vht(hapd, pos); #endif /* CONFIG_IEEE80211AC */ /* Wi-Fi Alliance WMM */ pos = hostapd_eid_wmm(hapd, pos); #ifdef CONFIG_WPS if (hapd->conf->wps_state && hapd->wps_probe_resp_ie) { os_memcpy(pos, wpabuf_head(hapd->wps_probe_resp_ie), wpabuf_len(hapd->wps_probe_resp_ie)); pos += wpabuf_len(hapd->wps_probe_resp_ie); } #endif /* CONFIG_WPS */ #ifdef CONFIG_P2P if ((hapd->conf->p2p & P2P_ENABLED) && is_p2p && hapd->p2p_probe_resp_ie) { os_memcpy(pos, wpabuf_head(hapd->p2p_probe_resp_ie), wpabuf_len(hapd->p2p_probe_resp_ie)); pos += wpabuf_len(hapd->p2p_probe_resp_ie); } #endif /* CONFIG_P2P */ #ifdef CONFIG_P2P_MANAGER if ((hapd->conf->p2p & (P2P_MANAGE | P2P_ENABLED | P2P_GROUP_OWNER)) == P2P_MANAGE) pos = hostapd_eid_p2p_manage(hapd, pos); #endif /* CONFIG_P2P_MANAGER */ #ifdef CONFIG_HS20 pos = hostapd_eid_hs20_indication(hapd, pos); pos = hostapd_eid_osen(hapd, pos); #endif /* CONFIG_HS20 */ if (hapd->conf->vendor_elements) { os_memcpy(pos, wpabuf_head(hapd->conf->vendor_elements), wpabuf_len(hapd->conf->vendor_elements)); pos += wpabuf_len(hapd->conf->vendor_elements); } *resp_len = pos - (u8 *) resp; return (u8 *) resp; } enum ssid_match_result { NO_SSID_MATCH, EXACT_SSID_MATCH, WILDCARD_SSID_MATCH }; static enum ssid_match_result ssid_match(struct hostapd_data *hapd, const u8 *ssid, size_t ssid_len, const u8 *ssid_list, size_t ssid_list_len) { const u8 *pos, *end; int wildcard = 0; if (ssid_len == 0) wildcard = 1; if (ssid_len == hapd->conf->ssid.ssid_len && os_memcmp(ssid, hapd->conf->ssid.ssid, ssid_len) == 0) return EXACT_SSID_MATCH; if (ssid_list == NULL) return wildcard ? WILDCARD_SSID_MATCH : NO_SSID_MATCH; pos = ssid_list; end = ssid_list + ssid_list_len; while (pos + 1 <= end) { if (pos + 2 + pos[1] > end) break; if (pos[1] == 0) wildcard = 1; if (pos[1] == hapd->conf->ssid.ssid_len && os_memcmp(pos + 2, hapd->conf->ssid.ssid, pos[1]) == 0) return EXACT_SSID_MATCH; pos += 2 + pos[1]; } return wildcard ? WILDCARD_SSID_MATCH : NO_SSID_MATCH; } void sta_track_expire(struct hostapd_iface *iface, int force) { struct os_reltime now; struct hostapd_sta_info *info; if (!iface->num_sta_seen) return; os_get_reltime(&now); while ((info = dl_list_first(&iface->sta_seen, struct hostapd_sta_info, list))) { if (!force && !os_reltime_expired(&now, &info->last_seen, iface->conf->track_sta_max_age)) break; force = 0; wpa_printf(MSG_MSGDUMP, "%s: Expire STA tracking entry for " MACSTR, iface->bss[0]->conf->iface, MAC2STR(info->addr)); dl_list_del(&info->list); iface->num_sta_seen--; os_free(info); } } static struct hostapd_sta_info * sta_track_get(struct hostapd_iface *iface, const u8 *addr) { struct hostapd_sta_info *info; dl_list_for_each(info, &iface->sta_seen, struct hostapd_sta_info, list) if (os_memcmp(addr, info->addr, ETH_ALEN) == 0) return info; return NULL; } void sta_track_add(struct hostapd_iface *iface, const u8 *addr) { struct hostapd_sta_info *info; info = sta_track_get(iface, addr); if (info) { /* Move the most recent entry to the end of the list */ dl_list_del(&info->list); dl_list_add_tail(&iface->sta_seen, &info->list); os_get_reltime(&info->last_seen); return; } /* Add a new entry */ info = os_zalloc(sizeof(*info)); os_memcpy(info->addr, addr, ETH_ALEN); os_get_reltime(&info->last_seen); if (iface->num_sta_seen >= iface->conf->track_sta_max_num) { /* Expire oldest entry to make room for a new one */ sta_track_expire(iface, 1); } wpa_printf(MSG_MSGDUMP, "%s: Add STA tracking entry for " MACSTR, iface->bss[0]->conf->iface, MAC2STR(addr)); dl_list_add_tail(&iface->sta_seen, &info->list); iface->num_sta_seen++; } struct hostapd_data * sta_track_seen_on(struct hostapd_iface *iface, const u8 *addr, const char *ifname) { struct hapd_interfaces *interfaces = iface->interfaces; size_t i, j; for (i = 0; i < interfaces->count; i++) { struct hostapd_data *hapd = NULL; iface = interfaces->iface[i]; for (j = 0; j < iface->num_bss; j++) { hapd = iface->bss[j]; if (os_strcmp(ifname, hapd->conf->iface) == 0) break; hapd = NULL; } if (hapd && sta_track_get(iface, addr)) return hapd; } return NULL; } void handle_probe_req(struct hostapd_data *hapd, const struct ieee80211_mgmt *mgmt, size_t len, int ssi_signal) { u8 *resp; struct ieee802_11_elems elems; const u8 *ie; size_t ie_len; size_t i, resp_len; int noack; enum ssid_match_result res; ie = mgmt->u.probe_req.variable; if (len < IEEE80211_HDRLEN + sizeof(mgmt->u.probe_req)) return; if (hapd->iconf->track_sta_max_num) sta_track_add(hapd->iface, mgmt->sa); ie_len = len - (IEEE80211_HDRLEN + sizeof(mgmt->u.probe_req)); for (i = 0; hapd->probereq_cb && i < hapd->num_probereq_cb; i++) if (hapd->probereq_cb[i].cb(hapd->probereq_cb[i].ctx, mgmt->sa, mgmt->da, mgmt->bssid, ie, ie_len, ssi_signal) > 0) return; if (!hapd->iconf->send_probe_response) return; if (ieee802_11_parse_elems(ie, ie_len, &elems, 0) == ParseFailed) { wpa_printf(MSG_DEBUG, "Could not parse ProbeReq from " MACSTR, MAC2STR(mgmt->sa)); return; } if ((!elems.ssid || !elems.supp_rates)) { wpa_printf(MSG_DEBUG, "STA " MACSTR " sent probe request " "without SSID or supported rates element", MAC2STR(mgmt->sa)); return; } /* * No need to reply if the Probe Request frame was sent on an adjacent * channel. IEEE Std 802.11-2012 describes this as a requirement for an * AP with dot11RadioMeasurementActivated set to true, but strictly * speaking does not allow such ignoring of Probe Request frames if * dot11RadioMeasurementActivated is false. Anyway, this can help reduce * number of unnecessary Probe Response frames for cases where the STA * is less likely to see them (Probe Request frame sent on a * neighboring, but partially overlapping, channel). */ if (elems.ds_params && hapd->iface->current_mode && (hapd->iface->current_mode->mode == HOSTAPD_MODE_IEEE80211G || hapd->iface->current_mode->mode == HOSTAPD_MODE_IEEE80211B) && hapd->iconf->channel != elems.ds_params[0]) { wpa_printf(MSG_DEBUG, "Ignore Probe Request due to DS Params mismatch: chan=%u != ds.chan=%u", hapd->iconf->channel, elems.ds_params[0]); return; } #ifdef CONFIG_P2P if (hapd->p2p && elems.wps_ie) { struct wpabuf *wps; wps = ieee802_11_vendor_ie_concat(ie, ie_len, WPS_DEV_OUI_WFA); if (wps && !p2p_group_match_dev_type(hapd->p2p_group, wps)) { wpa_printf(MSG_MSGDUMP, "P2P: Ignore Probe Request " "due to mismatch with Requested Device " "Type"); wpabuf_free(wps); return; } wpabuf_free(wps); } if (hapd->p2p && elems.p2p) { struct wpabuf *p2p; p2p = ieee802_11_vendor_ie_concat(ie, ie_len, P2P_IE_VENDOR_TYPE); if (p2p && !p2p_group_match_dev_id(hapd->p2p_group, p2p)) { wpa_printf(MSG_MSGDUMP, "P2P: Ignore Probe Request " "due to mismatch with Device ID"); wpabuf_free(p2p); return; } wpabuf_free(p2p); } #endif /* CONFIG_P2P */ if (hapd->conf->ignore_broadcast_ssid && elems.ssid_len == 0 && elems.ssid_list_len == 0) { wpa_printf(MSG_MSGDUMP, "Probe Request from " MACSTR " for " "broadcast SSID ignored", MAC2STR(mgmt->sa)); return; } #ifdef CONFIG_P2P if ((hapd->conf->p2p & P2P_GROUP_OWNER) && elems.ssid_len == P2P_WILDCARD_SSID_LEN && os_memcmp(elems.ssid, P2P_WILDCARD_SSID, P2P_WILDCARD_SSID_LEN) == 0) { /* Process P2P Wildcard SSID like Wildcard SSID */ elems.ssid_len = 0; } #endif /* CONFIG_P2P */ res = ssid_match(hapd, elems.ssid, elems.ssid_len, elems.ssid_list, elems.ssid_list_len); if (res == NO_SSID_MATCH) { if (!(mgmt->da[0] & 0x01)) { wpa_printf(MSG_MSGDUMP, "Probe Request from " MACSTR " for foreign SSID '%s' (DA " MACSTR ")%s", MAC2STR(mgmt->sa), wpa_ssid_txt(elems.ssid, elems.ssid_len), MAC2STR(mgmt->da), elems.ssid_list ? " (SSID list)" : ""); } return; } #ifdef CONFIG_INTERWORKING if (hapd->conf->interworking && elems.interworking && elems.interworking_len >= 1) { u8 ant = elems.interworking[0] & 0x0f; if (ant != INTERWORKING_ANT_WILDCARD && ant != hapd->conf->access_network_type) { wpa_printf(MSG_MSGDUMP, "Probe Request from " MACSTR " for mismatching ANT %u ignored", MAC2STR(mgmt->sa), ant); return; } } if (hapd->conf->interworking && elems.interworking && (elems.interworking_len == 7 || elems.interworking_len == 9)) { const u8 *hessid; if (elems.interworking_len == 7) hessid = elems.interworking + 1; else hessid = elems.interworking + 1 + 2; if (!is_broadcast_ether_addr(hessid) && os_memcmp(hessid, hapd->conf->hessid, ETH_ALEN) != 0) { wpa_printf(MSG_MSGDUMP, "Probe Request from " MACSTR " for mismatching HESSID " MACSTR " ignored", MAC2STR(mgmt->sa), MAC2STR(hessid)); return; } } #endif /* CONFIG_INTERWORKING */ #ifdef CONFIG_P2P if ((hapd->conf->p2p & P2P_GROUP_OWNER) && supp_rates_11b_only(&elems)) { /* Indicates support for 11b rates only */ wpa_printf(MSG_EXCESSIVE, "P2P: Ignore Probe Request from " MACSTR " with only 802.11b rates", MAC2STR(mgmt->sa)); return; } #endif /* CONFIG_P2P */ /* TODO: verify that supp_rates contains at least one matching rate * with AP configuration */ if (hapd->conf->no_probe_resp_if_seen_on && is_multicast_ether_addr(mgmt->da) && is_multicast_ether_addr(mgmt->bssid) && sta_track_seen_on(hapd->iface, mgmt->sa, hapd->conf->no_probe_resp_if_seen_on)) { wpa_printf(MSG_MSGDUMP, "%s: Ignore Probe Request from " MACSTR " since STA has been seen on %s", hapd->conf->iface, MAC2STR(mgmt->sa), hapd->conf->no_probe_resp_if_seen_on); return; } #ifdef CONFIG_TESTING_OPTIONS if (hapd->iconf->ignore_probe_probability > 0.0 && drand48() < hapd->iconf->ignore_probe_probability) { wpa_printf(MSG_INFO, "TESTING: ignoring probe request from " MACSTR, MAC2STR(mgmt->sa)); return; } #endif /* CONFIG_TESTING_OPTIONS */ resp = hostapd_gen_probe_resp(hapd, mgmt, elems.p2p != NULL, &resp_len); if (resp == NULL) return; /* * If this is a broadcast probe request, apply no ack policy to avoid * excessive retries. */ noack = !!(res == WILDCARD_SSID_MATCH && is_broadcast_ether_addr(mgmt->da)); if (hostapd_drv_send_mlme(hapd, resp, resp_len, noack) < 0) wpa_printf(MSG_INFO, "handle_probe_req: send failed"); os_free(resp); wpa_printf(MSG_EXCESSIVE, "STA " MACSTR " sent probe request for %s " "SSID", MAC2STR(mgmt->sa), elems.ssid_len == 0 ? "broadcast" : "our"); } static u8 * hostapd_probe_resp_offloads(struct hostapd_data *hapd, size_t *resp_len) { /* check probe response offloading caps and print warnings */ if (!(hapd->iface->drv_flags & WPA_DRIVER_FLAGS_PROBE_RESP_OFFLOAD)) return NULL; #ifdef CONFIG_WPS if (hapd->conf->wps_state && hapd->wps_probe_resp_ie && (!(hapd->iface->probe_resp_offloads & (WPA_DRIVER_PROBE_RESP_OFFLOAD_WPS | WPA_DRIVER_PROBE_RESP_OFFLOAD_WPS2)))) wpa_printf(MSG_WARNING, "Device is trying to offload WPS " "Probe Response while not supporting this"); #endif /* CONFIG_WPS */ #ifdef CONFIG_P2P if ((hapd->conf->p2p & P2P_ENABLED) && hapd->p2p_probe_resp_ie && !(hapd->iface->probe_resp_offloads & WPA_DRIVER_PROBE_RESP_OFFLOAD_P2P)) wpa_printf(MSG_WARNING, "Device is trying to offload P2P " "Probe Response while not supporting this"); #endif /* CONFIG_P2P */ if (hapd->conf->interworking && !(hapd->iface->probe_resp_offloads & WPA_DRIVER_PROBE_RESP_OFFLOAD_INTERWORKING)) wpa_printf(MSG_WARNING, "Device is trying to offload " "Interworking Probe Response while not supporting " "this"); /* Generate a Probe Response template for the non-P2P case */ return hostapd_gen_probe_resp(hapd, NULL, 0, resp_len); } #endif /* NEED_AP_MLME */ int ieee802_11_build_ap_params(struct hostapd_data *hapd, struct wpa_driver_ap_params *params) { struct ieee80211_mgmt *head = NULL; u8 *tail = NULL; size_t head_len = 0, tail_len = 0; u8 *resp = NULL; size_t resp_len = 0; #ifdef NEED_AP_MLME u16 capab_info; u8 *pos, *tailpos; #define BEACON_HEAD_BUF_SIZE 256 #define BEACON_TAIL_BUF_SIZE 512 head = os_zalloc(BEACON_HEAD_BUF_SIZE); tail_len = BEACON_TAIL_BUF_SIZE; #ifdef CONFIG_WPS if (hapd->conf->wps_state && hapd->wps_beacon_ie) tail_len += wpabuf_len(hapd->wps_beacon_ie); #endif /* CONFIG_WPS */ #ifdef CONFIG_P2P if (hapd->p2p_beacon_ie) tail_len += wpabuf_len(hapd->p2p_beacon_ie); #endif /* CONFIG_P2P */ #ifdef CONFIG_FST if (hapd->iface->fst_ies) tail_len += wpabuf_len(hapd->iface->fst_ies); #endif /* CONFIG_FST */ if (hapd->conf->vendor_elements) tail_len += wpabuf_len(hapd->conf->vendor_elements); #ifdef CONFIG_IEEE80211AC if (hapd->conf->vendor_vht) { tail_len += 5 + 2 + sizeof(struct ieee80211_vht_capabilities) + 2 + sizeof(struct ieee80211_vht_operation); } #endif /* CONFIG_IEEE80211AC */ tailpos = tail = os_malloc(tail_len); if (head == NULL || tail == NULL) { wpa_printf(MSG_ERROR, "Failed to set beacon data"); os_free(head); os_free(tail); return -1; } head->frame_control = IEEE80211_FC(WLAN_FC_TYPE_MGMT, WLAN_FC_STYPE_BEACON); head->duration = host_to_le16(0); os_memset(head->da, 0xff, ETH_ALEN); os_memcpy(head->sa, hapd->own_addr, ETH_ALEN); os_memcpy(head->bssid, hapd->own_addr, ETH_ALEN); head->u.beacon.beacon_int = host_to_le16(hapd->iconf->beacon_int); /* hardware or low-level driver will setup seq_ctrl and timestamp */ capab_info = hostapd_own_capab_info(hapd); head->u.beacon.capab_info = host_to_le16(capab_info); pos = &head->u.beacon.variable[0]; /* SSID */ *pos++ = WLAN_EID_SSID; if (hapd->conf->ignore_broadcast_ssid == 2) { /* clear the data, but keep the correct length of the SSID */ *pos++ = hapd->conf->ssid.ssid_len; os_memset(pos, 0, hapd->conf->ssid.ssid_len); pos += hapd->conf->ssid.ssid_len; } else if (hapd->conf->ignore_broadcast_ssid) { *pos++ = 0; /* empty SSID */ } else { *pos++ = hapd->conf->ssid.ssid_len; os_memcpy(pos, hapd->conf->ssid.ssid, hapd->conf->ssid.ssid_len); pos += hapd->conf->ssid.ssid_len; } /* Supported rates */ pos = hostapd_eid_supp_rates(hapd, pos); /* DS Params */ pos = hostapd_eid_ds_params(hapd, pos); head_len = pos - (u8 *) head; tailpos = hostapd_eid_country(hapd, tailpos, tail + BEACON_TAIL_BUF_SIZE - tailpos); /* Power Constraint element */ tailpos = hostapd_eid_pwr_constraint(hapd, tailpos); /* ERP Information element */ tailpos = hostapd_eid_erp_info(hapd, tailpos); /* Extended supported rates */ tailpos = hostapd_eid_ext_supp_rates(hapd, tailpos); /* RSN, MDIE, WPA */ tailpos = hostapd_eid_wpa(hapd, tailpos, tail + BEACON_TAIL_BUF_SIZE - tailpos); tailpos = hostapd_eid_rm_enabled_capab(hapd, tailpos, tail + BEACON_TAIL_BUF_SIZE - tailpos); tailpos = hostapd_eid_bss_load(hapd, tailpos, tail + BEACON_TAIL_BUF_SIZE - tailpos); #ifdef CONFIG_IEEE80211N tailpos = hostapd_eid_ht_capabilities(hapd, tailpos); tailpos = hostapd_eid_ht_operation(hapd, tailpos); #endif /* CONFIG_IEEE80211N */ tailpos = hostapd_eid_ext_capab(hapd, tailpos); /* * TODO: Time Advertisement element should only be included in some * DTIM Beacon frames. */ tailpos = hostapd_eid_time_adv(hapd, tailpos); tailpos = hostapd_eid_interworking(hapd, tailpos); tailpos = hostapd_eid_adv_proto(hapd, tailpos); tailpos = hostapd_eid_roaming_consortium(hapd, tailpos); tailpos = hostapd_add_csa_elems(hapd, tailpos, tail, &hapd->cs_c_off_beacon, &hapd->cs_c_off_ecsa_beacon); #ifdef CONFIG_FST if (hapd->iface->fst_ies) { os_memcpy(tailpos, wpabuf_head(hapd->iface->fst_ies), wpabuf_len(hapd->iface->fst_ies)); tailpos += wpabuf_len(hapd->iface->fst_ies); } #endif /* CONFIG_FST */ #ifdef CONFIG_IEEE80211AC if (hapd->iconf->ieee80211ac && !hapd->conf->disable_11ac) { tailpos = hostapd_eid_vht_capabilities(hapd, tailpos); tailpos = hostapd_eid_vht_operation(hapd, tailpos); } if (hapd->conf->vendor_vht) tailpos = hostapd_eid_vendor_vht(hapd, tailpos); #endif /* CONFIG_IEEE80211AC */ /* Wi-Fi Alliance WMM */ tailpos = hostapd_eid_wmm(hapd, tailpos); #ifdef CONFIG_WPS if (hapd->conf->wps_state && hapd->wps_beacon_ie) { os_memcpy(tailpos, wpabuf_head(hapd->wps_beacon_ie), wpabuf_len(hapd->wps_beacon_ie)); tailpos += wpabuf_len(hapd->wps_beacon_ie); } #endif /* CONFIG_WPS */ #ifdef CONFIG_P2P if ((hapd->conf->p2p & P2P_ENABLED) && hapd->p2p_beacon_ie) { os_memcpy(tailpos, wpabuf_head(hapd->p2p_beacon_ie), wpabuf_len(hapd->p2p_beacon_ie)); tailpos += wpabuf_len(hapd->p2p_beacon_ie); } #endif /* CONFIG_P2P */ #ifdef CONFIG_P2P_MANAGER if ((hapd->conf->p2p & (P2P_MANAGE | P2P_ENABLED | P2P_GROUP_OWNER)) == P2P_MANAGE) tailpos = hostapd_eid_p2p_manage(hapd, tailpos); #endif /* CONFIG_P2P_MANAGER */ #ifdef CONFIG_HS20 tailpos = hostapd_eid_hs20_indication(hapd, tailpos); tailpos = hostapd_eid_osen(hapd, tailpos); #endif /* CONFIG_HS20 */ if (hapd->conf->vendor_elements) { os_memcpy(tailpos, wpabuf_head(hapd->conf->vendor_elements), wpabuf_len(hapd->conf->vendor_elements)); tailpos += wpabuf_len(hapd->conf->vendor_elements); } tail_len = tailpos > tail ? tailpos - tail : 0; resp = hostapd_probe_resp_offloads(hapd, &resp_len); #endif /* NEED_AP_MLME */ os_memset(params, 0, sizeof(*params)); params->head = (u8 *) head; params->head_len = head_len; params->tail = tail; params->tail_len = tail_len; params->proberesp = resp; params->proberesp_len = resp_len; params->dtim_period = hapd->conf->dtim_period; params->beacon_int = hapd->iconf->beacon_int; params->basic_rates = hapd->iface->basic_rates; params->ssid = hapd->conf->ssid.ssid; params->ssid_len = hapd->conf->ssid.ssid_len; if ((hapd->conf->wpa & (WPA_PROTO_WPA | WPA_PROTO_RSN)) == (WPA_PROTO_WPA | WPA_PROTO_RSN)) params->pairwise_ciphers = hapd->conf->wpa_pairwise | hapd->conf->rsn_pairwise; else if (hapd->conf->wpa & WPA_PROTO_RSN) params->pairwise_ciphers = hapd->conf->rsn_pairwise; else if (hapd->conf->wpa & WPA_PROTO_WPA) params->pairwise_ciphers = hapd->conf->wpa_pairwise; params->group_cipher = hapd->conf->wpa_group; params->key_mgmt_suites = hapd->conf->wpa_key_mgmt; params->auth_algs = hapd->conf->auth_algs; params->wpa_version = hapd->conf->wpa; params->privacy = hapd->conf->ssid.wep.keys_set || hapd->conf->wpa || (hapd->conf->ieee802_1x && (hapd->conf->default_wep_key_len || hapd->conf->individual_wep_key_len)); switch (hapd->conf->ignore_broadcast_ssid) { case 0: params->hide_ssid = NO_SSID_HIDING; break; case 1: params->hide_ssid = HIDDEN_SSID_ZERO_LEN; break; case 2: params->hide_ssid = HIDDEN_SSID_ZERO_CONTENTS; break; } params->isolate = hapd->conf->isolate; params->smps_mode = hapd->iconf->ht_capab & HT_CAP_INFO_SMPS_MASK; #ifdef NEED_AP_MLME params->cts_protect = !!(ieee802_11_erp_info(hapd) & ERP_INFO_USE_PROTECTION); params->preamble = hapd->iface->num_sta_no_short_preamble == 0 && hapd->iconf->preamble == SHORT_PREAMBLE; if (hapd->iface->current_mode && hapd->iface->current_mode->mode == HOSTAPD_MODE_IEEE80211G) params->short_slot_time = hapd->iface->num_sta_no_short_slot_time > 0 ? 0 : 1; else params->short_slot_time = -1; if (!hapd->iconf->ieee80211n || hapd->conf->disable_11n) params->ht_opmode = -1; else params->ht_opmode = hapd->iface->ht_op_mode; #endif /* NEED_AP_MLME */ params->interworking = hapd->conf->interworking; if (hapd->conf->interworking && !is_zero_ether_addr(hapd->conf->hessid)) params->hessid = hapd->conf->hessid; params->access_network_type = hapd->conf->access_network_type; params->ap_max_inactivity = hapd->conf->ap_max_inactivity; #ifdef CONFIG_P2P params->p2p_go_ctwindow = hapd->iconf->p2p_go_ctwindow; #endif /* CONFIG_P2P */ #ifdef CONFIG_HS20 params->disable_dgaf = hapd->conf->disable_dgaf; if (hapd->conf->osen) { params->privacy = 1; params->osen = 1; } #endif /* CONFIG_HS20 */ return 0; } void ieee802_11_free_ap_params(struct wpa_driver_ap_params *params) { os_free(params->tail); params->tail = NULL; os_free(params->head); params->head = NULL; os_free(params->proberesp); params->proberesp = NULL; } int ieee802_11_set_beacon(struct hostapd_data *hapd) { struct wpa_driver_ap_params params; struct hostapd_freq_params freq; struct hostapd_iface *iface = hapd->iface; struct hostapd_config *iconf = iface->conf; struct wpabuf *beacon, *proberesp, *assocresp; int res, ret = -1; if (hapd->csa_in_progress) { wpa_printf(MSG_ERROR, "Cannot set beacons during CSA period"); return -1; } hapd->beacon_set_done = 1; if (ieee802_11_build_ap_params(hapd, ¶ms) < 0) return -1; if (hostapd_build_ap_extra_ies(hapd, &beacon, &proberesp, &assocresp) < 0) goto fail; params.beacon_ies = beacon; params.proberesp_ies = proberesp; params.assocresp_ies = assocresp; params.reenable = hapd->reenable_beacon; hapd->reenable_beacon = 0; if (iface->current_mode && hostapd_set_freq_params(&freq, iconf->hw_mode, iface->freq, iconf->channel, iconf->ieee80211n, iconf->ieee80211ac, iconf->secondary_channel, iconf->vht_oper_chwidth, iconf->vht_oper_centr_freq_seg0_idx, iconf->vht_oper_centr_freq_seg1_idx, iface->current_mode->vht_capab) == 0) params.freq = &freq; res = hostapd_drv_set_ap(hapd, ¶ms); hostapd_free_ap_extra_ies(hapd, beacon, proberesp, assocresp); if (res) wpa_printf(MSG_ERROR, "Failed to set beacon parameters"); else ret = 0; fail: ieee802_11_free_ap_params(¶ms); return ret; } int ieee802_11_set_beacons(struct hostapd_iface *iface) { size_t i; int ret = 0; for (i = 0; i < iface->num_bss; i++) { if (iface->bss[i]->started && ieee802_11_set_beacon(iface->bss[i]) < 0) ret = -1; } return ret; } /* only update beacons if started */ int ieee802_11_update_beacons(struct hostapd_iface *iface) { size_t i; int ret = 0; for (i = 0; i < iface->num_bss; i++) { if (iface->bss[i]->beacon_set_done && iface->bss[i]->started && ieee802_11_set_beacon(iface->bss[i]) < 0) ret = -1; } return ret; } #endif /* CONFIG_NATIVE_WINDOWS */